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Regressing SARS-Cov-2 Sewage Measurements Onto COVID-19 Burden in the Population: a Proof-Of-Concept for Quantitative Environmental Surveillance

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Regressing SARS-Cov-2 Sewage Measurements Onto COVID-19 Burden in the Population: a Proof-Of-Concept for Quantitative Environmental Surveillance medRxiv preprint doi: https://doi.org/10.1101/2020.04.26.20073569; this version posted May 1, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission. Regressing SARS-CoV-2 sewage measurements onto COVID-19 burden in the population: a proof-of-concept for quantitative environmental surveillance Itay Bar-Or1+, Karin Yaniv2+, Marilou Shagan2, Eden Ozer9, Oran Erster1, Ella Mendelson1,12, Batya Mannasse1, Rachel Shirazi1, Esti Kramarsky-Winter2, Oded Nir5, Hala Abu-Ali5, Zeev Ronen5, Ehud Rinott6, Yair E. Lewis7, Eran Friedler9, Eden Bitkover10 , Yossi Paitan11, Yakir Berchenko4* and Ariel Kushmaro2,3* 1 Central Virology Lab, Ministry of Health, Sheba Medical Center, Israel 2 Avram and Stella Goldstein-Goren, Department of Biotechnology Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel. 3 The Ilse Katz Center for Meso and Nanoscale Science and Technology, Ben-Gurion University of the Negev, Be'er Sheva 8410501, Israel. 4 Department of Industrial Engineering and Management, Ben-Gurion University of the Negev, Beer- Sheva 84105, Israel 5 Zuckerberg Institute for Water Research (ZIWR), Blaustein Institutes for Desert Research, Ben- Gurion University of the Negev, Sede Boker, 84990, Israel 6 Faculty of Health Science, Ben-Gurion University of the Negev, Beer-Sheva, Israel 7 Faculty of Medicine, Technion-Israel Institute of Technology, Israel 8 Faculty of Civ. and Env. Eng., Technion-Israel Inst. of Technology; Haifa 32000, Israel 9 Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel 10 Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel 11 Clinical Microbiology Laboratory, Meir Medical Center, 44282, Kfar Saba, Israel. 12 School of Public Health, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel * Corresponding authors: [email protected], [email protected] + Equal contributors NOTE: This preprint reports new research that has not been certified by peer review and should not be used to guide clinical practice. 1 medRxiv preprint doi: https://doi.org/10.1101/2020.04.26.20073569; this version posted May 1, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission. Abstract SARS-CoV-2 is an RNA virus, a member of the coronavirus family of respiratory viruses that includes SARS-CoV-1 and MERS. COVID-19, the clinical syndrome caused by SARS- CoV-2, has evolved into a global pandemic with more than 2,900,000 people infected. It has had an acute and dramatic impact on health care systems, economies, and societies of affected countries within these few months. Widespread testing and tracing efforts are employed in many countries in order to contain and mitigate this pandemic. Recent data has indicated that fecal shedding of SARS-CoV-2 is common, and that the virus can be detected in wastewater. This indicates that wastewater monitoring is a potentially efficient tool for epidemiological surveillance of SARS-CoV-2 infection in large populations at relevant scales. Collecting raw sewage data, representing specific districts, and crosslinking this data with the number of infected people from each location, will enable us to derive and provide quantitative surveillance tools. In particular, this will provide important means to (i) estimate the extent of outbreaks and their spatial distributions, based primarily on in-sewer measurements (ii) manage the early-warning system quantitatively and efficiently (and similarly, verify disease elimination). Here we report the development of a virus concentration method using PEG or alum, providing an important a tool for detection of SARS-CoV-2 RNA in sewage and relating it to the local populations and geographic information. This will provide a proof of concept for the use of sewage associated virus data as a reliable epidemiological tool. 2 medRxiv preprint doi: https://doi.org/10.1101/2020.04.26.20073569; this version posted May 1, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission. Introduction Waterborne pathogens, including viruses, bacteria and protozoa can be shed into the urban water cycle via sewers, (Gormley et al. 2017 and 2020) urban runoff, agricultural runoff and wastewater discharges (Arnone and Walling, 2007; La Rosa et al., 2012). Indeed, it has been reported that there are high concentrations of virus particles in wastewater treatment plants (WWTP), varying from 108 to 1010 viral particles per milliliter (Otawa et al., 2007). Coronavirus SARS-CoV-2 is a novel RNA virus belonging to a group of viruses that includes amongst others SARS and MERS. SARS-CoV-2 is one of more than 37 coronaviruses in the Coronaviridae family, within the order Nidovirales, and it is currently causing a major pandemic with over 2,900,000 people infected globally. It causes COVID-19, a disease that has daunting effect on health care systems, economies, and societies of affected countries. As a member of the Coronaviridae, which includes viruses known to cause respiratory and/or intestinal infections, SARS-CoV-2 spreads primarily via micro droplets, reflecting its survivorship in humid environments (Chin et al. 2020). Recent reports have detailed SARS- CoV-2 shedding in human stool (Gao et al. 2020; Hindson 2020; Xu et al. 2020). Interestingly it has been demonstrated that a similar corona virus, SARS-CoV-1 can survive in sewage for 14 days at 4°C, and for 2 days at 20°C, and its RNA can be detected for 8 days, even though the virus was inactive (Gundy et al. 2009; Wang et al. 2005). In recent studies, the SARS-CoV-2 virus was reported to be present in wastewater in treatment facilities (Hindson et al. 2020; Medema et al. 2020; Naddeo and Liu 2020; Wurtzer et al. 2020; Wu et al. 2020). Despite this, we are still lacking sufficient studies regarding the fate of SARS- CoV-2 throughout the different stages of wastewater collection and treatment. Presence and prevalence of SARS-CoV-2 in wastewater provides a valuable epidemiological data source (Lodder & de Roda Husman, 2020). Wastewater-based epidemiology (WBE) is a new discipline concerned with mining chemical and biological information from municipal wastewater. WBE has been applied for populations around the globe to measure chemicals consumption and exposure patterns (Choi et al. 2019). It was proven to be useful for preclinical identification (i.e., before the population exhibited symptoms) of Aichi virus (Lodder & de Roda Husman, 2020), for monitoring antibiotic resistance on a global scale (Lodder & de Roda Husman 2020), for quantitative polio surveillance (Berchenko et al. 2017), and also as fecal indicators (Gu et al. 2018, Saeidi et al. 2018). In particular, in our previous work, (Berchenko et al. 2017) we obtained valuable epidemiological information regarding polio by analyzing two unique data sets collected during a “natural experiment” 3 medRxiv preprint doi: https://doi.org/10.1101/2020.04.26.20073569; this version posted May 1, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission. provided by the 2013 polio outbreak in Israel (wastewater data from different locations, and records of supplemental immunization with the live vaccine). The parametric characterization of the linear dose-dependent relationship between the number of poliovirus shedders and the amount of poliovirus in sewage yielded a powerful tool for quantitative environmental surveillance (Berchenko et al. 2017). Here we report a similar study aimed at developing similar quantitative tools for SARS-CoV-2 in wastewater. These results will enable early identification and spatial-based monitoring of future outbreaks, and could be used to confirm virus elimination or to validate the need for more containment efforts. Material and methods Sampling: Samples were taken from wastewater treatment plants in different locations in Israel (see Table 2) as well as samples of raw sewage from different districts from the Tel Aviv metropolis. Sampling equipment was sanitized and properly sterilized (cooler, sampling bottles, biohazard bags, etc.). In addition, we used automatic samplers at targeted hot-spot areas for 24 hours. Around 200 ml were collected every 30 min for the 24 hours. Samples from the automatic sampler (6-10 L) were transported immediately to the lab where samples were poured to 2L of clean plastic bottles. Fresh 1 ml of raw sewage was taken directly into lysis buffer for RNA extraction. The rest of the sample was stored at -20oC or -80oC for virus concentration and RNA extraction stages. Sample concentration and analysis: Viral particles from approximately 0.25-1 liter of sewage/wastewater /effluent samples were concentrated using first centrifugation to remove sediment and large particles. Secondary concentration of the supernatant was performed using polyethylene glycol (PEG) or alum (20mg/l) precipitation, followed by additional centrifugation. The mixture was incubated at 4°C with 100-rpm agitation for about 12h, then centrifuged at 14,000 g for 45 min at 4°C to pellet the virus particles. Virus particles were then resuspended in phosphate buffered saline (PBS). The aqueous phase (containing virus particles) was collected and filtered through a 0.22µm filter. Ultra-15 centrifugal tubes with a molecular weight cutoff of 30 kDa (Amicon) were used to further concentrate the sample to a final volume of 1 ml. Samples were stored at -20/-80°C until further analysis.
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